Earth handling machine



July 27, 1948a J, JARMIN 2,446,136

EARTH HANDLING MACHINE Filed Sept. 4, 1945 2 Sheets-Sheet 1 JAMES B. JARMIN INVHVTOR.

Illi

July 27, 1948. J. B. JARMIN 2,446,136

EARTH HANDLING MACHINE Filed Sept. 4, 1945 2 Sheets-Sheet 2 (0 o r\ (\1 cu o cu T? x x v "9 N l 7 (\1 S V T N m N a o (\1 N m m N cu Patentea 'July'z'l, 1948 UNITED STATES PATENT OFFICE.

a-Aa'm I James B. Jamin, Dallas, Ten, minor to Servis Equipment Company, Dallas, Tex.

Application September 4, 1945, Serial lilo. 814,148

This invention relates to new and useful improvements in earth handling machines.

One object of the invention is to provide an improved earth handling machine of the type known as bulldozers.

A particular object of the invention is to provide a bulldozer wherein the dozer blade while adjustably mounted, is sustained and braced in a new and novel manner, whereby the cutting stress is more uniformly distributed and the blade is adequately supported against longitudinal twisting, thus making for more emcient dozing.

A further object of the invention is to provide an improved blade mounting which may be attached to the rear axle of an ordinary tractor, whereby the load thrust is taken by the rear axle at a lower center of gravity and the tractor frame is left free for the installation of supporting and adjusting linkage.

Another object of the invention is to provide an improved bulldozer having novel and simple linkage mechanism for supporting and adjusting the blade; together with hydraulic means for actuating said linkage.

Still another object o! the invention is to provide an improved mounting bracket for a dozer blade having adequately spaced blade-attaching elements, whereby a pair oi such brackets may be attached to the mouldboard and push bars immediately above the cutterbladathus not only more directly taking the load thrust, but reducing displacement and twisting of the blade, transversely of the direction oftravel of said blade.

A construction designed to carry out the invention will be hereinafter described together with other features of the invention.

The invention will be more readilyunderstood from a reading of the following specification and by reference to the accompanying drawings,

wherein an example of the invention, is shown,

and wherein:

Fig. 1 is a side elevation of a bulldozer constructed in accordance with the invention,

Fig. 2 is a partial plan view or the same, Fig. 3 is a detail of one of the blade yokes, and Fig. 4 is a sectional view of the same. In the drawings, the numerals II and II designate complementary push bars disposed longitu- 3 Claims. (Cl. 37-144) While the rear ends of the push bars may be connected with the rear axle 01' the tractor, I prefer to mount it across the usual drawbar yoke Y. The drawbar yoke extends transversely and is carried by angular hangers it on the rear side of the axle B. These hangers are secured to the axle h'ousing by clamps IT. The bridle bar i3 is secured to the underside of the yoke by bolts i9, thus making it possible to remove said bolts and lower the rear end of the push bar assembly to the ground. By suspending or hanging the rear ends of the push bars from the rear axle, their center of gravity is lowered and they may be readily attached to various makes of tractors.

The push bars l0 and II have their forward ends terminating in front of the front wheels C v of the tractor, and pivotally support the dozer blade indicated generally at 20. The manner of pivoting the blade to the forward ends of the push bars .is important, and forms one of the novel features of the invention. At the forward end of each bar, a bracket or yoke 2| is secured and each yoke has a rearwardly projecting central shank 22 telescoping the end of the bar and secured therein by welding or other fastening means. Each yoke is provided with a transverse web 23, which is disposed longitudinally of the blade 20, and gives strength and rigidity to the yoke. At each side, the yoke is provided with outwardly and laterally extending trunnions 24.

The dozer blade 20 includes a longitudinal cutter blade 25 along its bottom, which is secured to the lower longitudinaledge of l a transverse mouldboard 26, which is curved upwardly and provided at each end with wings 21. The dozer blade is of ordinary construction, and any type may be employed. Angular brackets 28 are welded to the rear side of the mouldboard 28 near its bottom, and are spaced apart so as to register with the trunnions 24. These brackets are provided with U-bolts 29, which engagearoundthe trunnions 24 and pivot the blade 20 to the yokes, whereby said blade maybe adjusted arcuately in a vertical plane.-' It willbe observed thatlthe dinally on each side of a tractor indicated gener- 1 ally by the letter A. These bars are preferably tubular, which gives them strengthand rigidity, and makes them much lighter than solid bars. At the rear end of each bar, the shank of an eyeplug i2 isinserted and suitably secured by weld-- ing or other means. 'The rear ends of the push bars are connected by a bridle bar II, having shanks or trunnions l4 welded to the ends thereof.

The eyes of the plugs I: are .iournaied on'the trunnions between washers i8 and are confined by cotter pins ll.

, efilcient bulldozing.

'yokes are attached to the blade inwardly ofthe ends thereof, andthe trunnions of each yoke. are

spaced sufliciently to adequately brace the blade and prevent twisting thereof in a horizontal plane. It is pointed out that the loadthrust is sustained by the push bars ill and Land this thrust is contributed to the rear axle of the tractor at a low center of gravity, thus making for As the push bars are pivoted to the lower portion of the mouldboard 26, it is necessaryto brace the upper portion of said mouldboard in order to hold it in position when the excavated earth or soil accumulates against said mouldboard, between the wings 21. For this purpose, inclined brace bars 30 have their upper ends pivoted bea tween ears-3i secured to the upper rear sides of said mouldboard, and their lower ends supported on bolts 32 between clips 33 welded on the forwardends. of the push bars. It will be observed a that thebrace bars 30 are axially'alined with v the push bars and overhang the yokes centrally thereof. By this arrangement, the co-action of the trunnions 24 and brackets 28,-and ears 3| pro vide at each push bar, a triangular brace for the.

dozer blades 20; such brace being ot'sufllcient .amplitude to adequately sustain the rearward thrust of said blade. It is also pointed out that the-combination of the pivot points 24, 3|. and

4 I one end of the blade 20 being displaced upwardly, because one bell-crank lever cannot be swung without swinging -,the other lever. The upper the ground, it is only necessary to back the tractor ends of thelinks 39 are pivoted-to the arms 81 of the levers 35 by means of bolts 60. By removing the bolts 60 the entire front assembly may be dropped to the ground. When itis desired to detach the bulldozer equipment from the tractor, it is merelynecessary. totremove the bolts l9 and 60. The assemblybein'gunderslung and dropping to therefrom'to use'itifor other purposes.

32 provides at each yoke a triangular longitudinal brace which aids in'contributing the rearward thrustto' each push bar. 7 I

It is desirable to vertically adjust the dozer blade so that the cutter may not only be po sitioned to cut to the desired depth, but maintained in its adjusted position, and this is best done by hydraulic mechanism. on the forward end of the tractor frame G, pillow blocks 34 are mounted at each side, and a transverse rock shaft 35 is journaled therein with its ends projecting beyond said blocks. On each end'of the shaft 35, a bell-crank lever 36 is suitably fastened. The long arm 31 of each lever projects forwardly,

while the short arm 38 extends downwardly.

Links 39' have their upper ends pivoted to the forward ends of the arms 31, and their lower ends pivoted to e'ars 40, on the rear side of the mouldboard 26 at the medial portion thereof.

Tothe lower end of each arm "of the bellcrank levers, a clevis 4| is pivoted, and has the ,forward end of the pitman 42 suitably secured thereto. The rear end of the pitman is formed integ'ral with the'piston rod 43 of a hydraulic cylin- I der 44, which ispivotally' mounted on the side of the frame D. For pivotaily mounting the cylinder, a. bracket 45 is'secured to its rear end, and this bracket is journaled on a stud 46 projecting outwardly fromaspace block 41, secured to the tractor frame. For confining the bracket on the stud, an offset keeper 48 issuitably fastened on the block.

A flexible hose 49 is securedlto the rear end of the cylinder, and is connected at its rear end The with an elbow 50 by means of a-uni'on 5i. elbow-is connected with a suitable source of hydraulic supply, such-as an ordinary fluid pump (not shown), which is connected to the power take-ofi (not shown) of the tractor, as is common practice with such pumps. Fluid may be sup'-. plied to and exhausted from the cylinder 44 to move the piston rod 43 forwardly or rearwardly, whereby the bell-crank levers 36 are swung, and

the blade 20 is raised and lowered. By' using a hydraulic system, and employing a liquid such as oil, when the piston rods 43 -are moved forwardly and the supply of fluid is cut oil, such fluid will be trapped in i the cylinders and prevent rearward Patent is: a

The roregoing description of the invention isexplanatory thereof and; various changes in the size, shape and materials, as well as in the details of the illustrated construction may be inade,

departing tram the spirit-0mm invention.

What -I claihifand'desir'e to secure by Letters 1. A bulldozer including, a pair of-flongijtildinal push bars; means" for pivoting therear-ends of the bars to -a-'tract'or', a pair er yokes, each yoke having means' forjri'gidlysecuring it 'to' the frontend of one 'or'the'bars'anda transverse web, said yoke also having'trunnions'extendin'g outwardly and separated by the-web, 'a'd'ozer' blade, angular brackets rigidly attached to'the rear sideot the blade, and U -bolt's"secured in' the "bracxkets and in which the yoke trunnions are pivoted.

2. A bulldozer including,'a=pair of longitudinal push bars; means for "pivoting'the rear'ends of the bars to-a. tractor,- a" pair of y'okes, each yoke having means for rigidly securing it-'to.' the front end ofone'of the= bars and a transverse web, said yoke also having-.trunnions extending outwardly and separated by'th-e web, anxdozer blade, angular brackets rigidly attached :to the rear side of the blade, U-bolts secured in the brackets and in" which the yoke: trunnion's are pivoted, the ends of the yoke abutting-said U-.-bolts.-to hold the blade against lateral shifting, and-inclinedbraces having their lower ends pivoted on thebars andtheirupper ends pivoted to the rear side '01 the blade..

i 3. A'bulldozer including,apairot longitudinal push bars havingtubular front-ends, means-tor pivoting the rear, ends-oi the bars to a tractor,

a pair of. yokes,- each yokerhaving a rearwardly extendinglcentral shank telescoping the front end or one of the-bars: and'a transverse web and also trunnions extending ontwardly'separated by the web,-a dozer blade, angular brackets-'rigidiyattached to the rear; side of the; blade, and U -bolts' movement 'of the rods 43, thus sustaining the doz'erblade andpreventingj the cutter 25' from cutting; belowithe desired grade. By "supplying fluid to the cylinders 44, the levers 36 are swung to elevate thedezer blade;

It will lie-observed that the bell-crank levers 36 being fastened tothe ends: of the rock shaft I5, provide a transversely mounted U-shaped support for the links and the blade 20. Thisarrangement forms .anadequate brace against secured in the brackets and in which the yoke 1,522,378 a .f Jan 6', 1925 1,530,100; Ar-ndt" Mar.'1"l, 1925 1,713,030 a cmnniings May 14, 1929' -1,7-17,571- 1 Marran a June 18, 1929 $989,431 Jan: 29, 1935 1,997,001 ;Apr. 9, 1935v 2,242,472 Keeler May 20, 1941 within th scope' (if the appended claims, Without" Austin .'.1 June 20,1944 

